I bought a 2 1/2" non-slip Tumbler strip ruler by Creative Grids to make baby/toddler quilts with. It's about the forth item on my bucket list of pattern to do. Will probably get around to it next month. I also have the larger size of this same ruler that I'm wanting to make a bed quilt for myself with... on the bucket list too. I'll probably mix my tumblers up instead of matchng them as you have and add in some Kona snow fabric.
Aren't charity quilts always more fun to make?